package org.xuyuji.study.account.persist;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.xuyuji.study.account.persist.exception.AccountPersistException;

public class AccountPersistServerImpl implements AccountPersistServer{
	
	private static final String ELEMENT_ROOT = "account-persist";
	private static final String ELEMENT_ACCOUNTS = "accounts";
	private static final String ELEMENT_ACCOUNT_ID = "id";
	private static final String ELEMENT_ACCOUNT_NAME = "name";
	private static final String ELEMENT_ACCOUNT_EMAIL = "email";
	private static final String ELEMENT_ACCOUNT_PASSWORD = "password";
	private static final String ELEMENT_ACCOUNT_ACTIVATED = "activated";
	
	private String file = "f:/account-persist.xml";
	
	private SAXReader reader = new SAXReader();
	
	public Account createAccount(Account account)
			throws AccountPersistException {
		// TODO Auto-generated method stub
		return null;
	}

	public Account readAccount(String id) throws AccountPersistException {
		Document doc = readDocument();
		
		Element accountsEle = doc.getRootElement().element(ELEMENT_ACCOUNTS);
		for(Element accountEle : (List<Element>)accountsEle.elements()){
			if(accountEle.elementText(ELEMENT_ACCOUNT_ID).equals(id)){
				return buildAccount(accountEle);
			}
		}
		return null;
	}

	public Account updateAccount(Account account)
			throws AccountPersistException {
		// TODO Auto-generated method stub
		return null;
	}

	public void deleteAccount(String id) throws AccountPersistException {
		// TODO Auto-generated method stub
		
	}
	
	public String getFile() {
		return file;
	}

	public void setFile(String file) {
		this.file = file;
	}

	private Document readDocument() throws AccountPersistException{
		File dataFile = new File(file);
		
		if(!dataFile.exists()){
			dataFile.getParentFile().mkdirs();
			Document doc = DocumentFactory.getInstance().createDocument();
			Element rootEle = doc.addElement(ELEMENT_ROOT);
			rootEle.addElement(ELEMENT_ACCOUNTS);
			writeDocument(doc);
		}
		
		try {
			return reader.read(new File(file));
		} catch (DocumentException e) {
			throw new AccountPersistException("Unable to read persist data xml", e);
		}
	}
	
	private void writeDocument(Document doc) throws AccountPersistException{
		Writer out = null;
		try{
			out = new OutputStreamWriter(new FileOutputStream(file), "utf-8");
			XMLWriter writer = new XMLWriter(out, OutputFormat.createPrettyPrint());
			writer.write(doc);
		}catch(IOException e){
			throw new AccountPersistException("Unable to write persist data xml", e);
		}finally{
			try {
				out.close();
			} catch (IOException e) {
				throw new AccountPersistException("Unable to close persist data xml writer", e);
			}
		}
	}
	
	private Account buildAccount(Element element){
		Account account = new Account();
		
		account.setId(element.elementText(ELEMENT_ACCOUNT_ID));
		account.setName(element.elementText(ELEMENT_ACCOUNT_NAME));
		account.setEmail(element.elementText(ELEMENT_ACCOUNT_EMAIL));
		account.setPassword(element.elementText(ELEMENT_ACCOUNT_PASSWORD));
		account.setActivated("true".equals(element.elementText(ELEMENT_ACCOUNT_ACTIVATED)));
		
		return account;
	}
	
	public static void main(String[] args) throws AccountPersistException {
		AccountPersistServerImpl test = new AccountPersistServerImpl();
		Account account = test.readAccount("1");
		System.out.println(account);
	}
}
